The invention discloses a self-adaptive template system for repairing a concrete beam in a tidal range zone. The system comprises an end retractable template assembly, a body fixed length template assembly, a waist-intercepting closing assembly and a free adaptive end assembly. The end retractable template assembly comprises a fixed side plate, a movable side plate, an end bottom plate, an end transverse tightening device, a longitudinal tightening device and a retractable end plate. The body fixed length template assembly comprises a body fixed side plate, a body movable side plate, a body bottom plate and a body transverse tightening device. The waist-intercepting closing assembly comprises a bottom hydraulic sealing device and a side sealing device. The free adaptive end assembly comprises a free flexible plate, an inflated sealing strip, a plate sleeve transverse tightening device, a bottom plate sleeve, a movable side plate sleeve and a fixed side plate sleeve. The invention provides the beam repair template which is not affected by tide level and water level, has a good sealing property, can be repeatedly used and is relatively high in construction speed.